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# mode: run
from cpython.number cimport PyNumber_InPlacePower
def ipow(a, b, c):
# As far as DW can tell, calling through this C API call is the
# only way to actually use ternary __ipow__
return PyNumber_InPlacePower(a, b, c)
# three-arg ipow can only work safely on Py3.8+
# and so tests are in a separate file
cdef class TwoOrThreeArgIPow:
"""
>>> a = TwoOrThreeArgIPow('a')
>>> a**=2
>>> print(a)
a**2[None]
>>> print(ipow(TwoOrThreeArgIPow('a'), 'x', 'y'))
a**x[y]
"""
cdef str name
def __init__(self, name):
self.name = name
def __ipow__(self, other, base=None):
return f"{self.name}**{other}[{base}]"
cdef class ThreeArgIPow:
"""
Note that it's not possible to detect if this is called in a 2-arg context
since the Python interpreter just passes None
>>> a = ThreeArgIPow('a')
>>> a**=2
>>> print(a)
a**2[None]
>>> print(ipow(ThreeArgIPow('a'), 'x', 'y'))
a**x[y]
"""
cdef str name
def __init__(self, name):
self.name = name
def __ipow__(self, other, base):
return f"{self.name}**{other}[{base}]"
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